<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>Inline Script using eval</title>
</head>
<body>
<input type="button" onmouseover="document.body.insertAdjacentHTML('beforeend', '&lt;br/&gt;' + eval('2+2'));"
       value="eval"/>

</body>
</html>